Life Sciences Cloud fields extend the standard Event Relation object to represent a person (a user, lead, or contact) or a resource (such as a conference room) invited to an event.
Description: Contains the ID of the event. This value can’t be changed after it’s been specified.
This is a relationship field.
Relationship Name: Event
Relationship Type: Lookup
Refers To: Event
RelationId
Type: reference
Properties: Create, Filter, Group, Sort
Description: Contains the ID of the person (User, Contact, or Lead) or the resource invited to an event. When Shared Activities is enabled, RelationId can also contain the ID of an account, opportunity, or other object related to an event.
This value can’t be changed after it’s been specified.